Drive-chain



(No Model.) 2 SheetsSheet 1. T. J. OHRISTY. DRIVE GHAIN.

Nb. 587,387. Patented Aug; 3, 1897.

will II (No Model.) 2 SheetsSheet 2.

T. J. CHRISTY.

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J rTED STATES THOMAS J. CI-IRISTY, OF ST. LOUIS, MISSOURI.

DRIVE-CHAIN.

SPECIFICATION forming part of Letters Patent No. 587,387, dated August3, 1897.

Application filed January 29,1896. Serial No. 577,228. (No model.)

To otZZ whom it may concern:

Be it known that I, THOMAS J. CHRIsTY, of the city of St. Louis, Stateof Missouri, have invented certain new and useful Improvements inDrive-Chains, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, forming apart hereof.

My invention relates to drive-chains; and it consists in the novelconstruction, combination, and arrangement of parts hereinafter shown,described, and claimed.

Figure 1 is a side elevation of the front and rear sprocket-wheels of abicycle carrying my improved drive-chain. perspective of a'bell-cranklever of which I make use in the construction of my improved chain. Fig.3 is a View in perspective of a link of which I make use. Fig. 4 is avertical sectional view on the line 4 4 of Fig. 5.

Fig. 5 is a rear end elevation of the rear sprocket-wheel and chain.Fig. 6 is a vertical sectional View of the front sprocket-wheel andchain on the line 6 6 of Fig. 1. Fig. 7 is a horizontal sectional viewof the bell-crank lever and link of which I make use in the constructionof my improved chain, said View being taken approximately on the line 7'7 of Fig. 4. Fig. 8 is a detail horizontal sectional view of amodifiedform of one end of the link shown in Fig. 3.

Referring by numerals to the drawings, 1 represents the maindrivingshaft, and the grooved sprocket-wheel 2 is securely fixed theretoin the usual way, and said sprocketwheel has the flange 3 at each sideof the groove 4, and said flanges are provided with the teeth orsprockets 5, which engage the projections 6 on the links 7.

The links 7, as shown, consist of the sections 8 and 0, so arranged asthat the projections 6 are opposite each other, and the shouldered rivet10 passes through said projections 6 and serve to connect said linkstogether. Each of said links is provided with extensions 11, having thelugs 12 upon their adjacent inner sides and at their free ends. Theshouldered rivets 10 pass through the perforations 13 in said links 7and the inner ends Fig. 2 is a view in,

of the lugs 12 meet, thus forminga connection between the free ends ofthe projections 11.

The bell-crank lever 14 is pi votally mo u nted between the sections 8and 9 of the link 7 and upon the shouldered rivet 10. In the short end15 of said bell-crank lever is a recess or slot 16. The recess 16 of aparticular link engages the lugs '12 of the next link in front of thatparticular link. The long arm 17 of the bell-crank lever has upon itsouter end projections 18, which projections engage in the recesses 19 ofthe flanges 20 of the driven wheel. The flanges 20 are held a fixeddistance apart by the hub 21, secured to the shaft 22.

In the operation of my improved chain the projections 6 upon the links 7engage between the teeth of the driving sprocket-wheel and theprojections 18 upon the bell-crank lever 17 engage between the teethupon the driven sprocket-wheel.

I claim 1. In a drive-chain, links pivoted together each of which linksconsists of a pair of bars in parallel position and a pivot passingthrough the end of one link and also passing through the next link at apointintermediate of its ends and thus forming a projection upon saidlink; bell-crank levers mounted upon said pivots and between said bars,each of said bell-crank levers having an opening in its short end whichopening is engaged by said projection upon the next adjoining link,substantially as specified.

2. In a drive-chain, links, each consisting of a pair of bars, a pinpassing through one end of each link, said pin also passing through thenext adjacent link ata point intermediate of its end, a bell-crank levermounted between said bars and upon said pivot, connections between thefree ends of said bars 0 and engaging the short end of said bell-cranklever, and projections'upon the long end of said bell-crank lever anddesigned to engage the sprockets of the driven wheel, said linkscarrying projections designed to engage the 5 sprockets of thedriving-wheel, substantially as specified.

' 3. In a drive-chain, the secticnsS and 9,

the oppositely-arranged projections 6 at one gage the lugs 12 of thenext adjacent link, end of said sections, the shouldered rivet 10 andthe projections 18 upon the long end of 10 passing through saidprojections and consaid hell-crank lever, substantially as specinectingsaid sections, the extensions 11, the fled.

lugs 12 upon said extensions, the bell-crank THOMAS J. CIIRISTY. lever14 mounted upon the rivet 10 and be- Vitnesses:

tween the sections 8 and 9 and having the HENRY KAHLO,

recess 16 in its short end and designed to en- CHARLES PIoKLEs.

